1 files changed, 5 insertions, 0 deletions
diff --git a/ext/tk/lib/tk.rb b/ext/tk/lib/tk.rb
index dca4b8892e..af9c63f72a 100644
--- a/ext/tk/lib/tk.rb
+++ b/ext/tk/lib/tk.rb
@@ -1668,6 +1668,11 @@ module Tk
   def Tk.update_idletasks
     update(true)
   end
+  def update(idle=nil)
+    # only for backward compatibility (This never be recommended to use)
+    Tk.update(idle)
+    self
+  end
 
 =begin
   #  See tcltklib.c for the reason of why the following methods are disabled.